Mortise lock



F. E. BEST MORTISE LOCK Jan. 5 1926.

Filed June '7, 1923 Patented Jan. 5, 1926.

UNITED STATES PATENT OFFICE.

FRANK ELLISON BEST, OF SEATTLE, WASHINGTON, ASSIGNOR TO FRANK E. BEST,INCL,

OF SEATTLE, WASHINGTON, A CORPORATION OF WASHINGTON.

MORTISE LOCK.

Application filed June 7, 1923.

To all wk am i only concern:

Be it known that I, FRANK ELLISON Bnsr, a citizen of the United States,residing at Seattle, in the county of King and State of Vashington, haveinvented a new and useful. Mortise Lock, of which the following is aspecification.

My invention relates to improvements in pin tumbler mortise locks andthe object of my improvement is to provide a pin tumbler mortise lock ofthe cabinet type that may be successfully applied to relatively thindoors.

In the application of pin tumbler looking structure to locks of themortise type it is common practice on heavy locks for doors ofconsiderable thickness to provide a threaded opening in the secondarylock housing that contains the latch mechanism and, in assembling, toscrew the lock core that contains the pin tumbler structure into saidthreaded opening after the secondary mechanism is inserted into themortise in the door and to then look said core against turning by ascrew that is operated from the front edge of the door and is renderedinaccessible when the door is closed.

This method of application is not adaptable on thin doors of the cabinettype because the secondary lock housing is, of necessity, made fromlight material that does not afford suflicient strength to permitattachment in this manner, and further, because there is not suflicientroom for the locking screw in thin mortise locks of this type.

The present invention makes possible the adaptation of a pin tumblerlocking structure to a thin mortise lock of this nature by providing alock having a core case from which the core may be removed, and, byproviding means within the core case that is accessible only when thelock core is removed for securing the core case to the secondary lockhousing. The removable core thus makes possible a structure that permitsthe use of pin tumbler mechanism in a thin mortise lock of this natureand the use of a pin tumbler mechanism makes possible the carrying outof a one key system in which an individual needs only one key to operateany number of different locks.

With the above and other objects in Serial No. 643,962.

view, the invention consists in the novel construction, adaptation andcombination of parts as will be more clearly hereinafter described andclaimed.

In the accompanying drawings Figure 1 is a fragmentary view in elevationshowing the edge of a door in which a pin tuniibler mortise lockconstructed in accordance with my invention is installed.

Fig. 2 is a fragmentary view in elevation showing a portion of the sideof the same door.

Fig. 3 is a detached view in side elevation of the mortise lock with thelock core removed.

Fig. 4 is a sectional view substantially on broken line H of Fig. 3.

Figs. 5, 6 and 7 are detached perspective views of the secondary lock orlatch housing, the lock core housing, and the lock core respectively assaid three parts might appear if detached and moved apart a shortdistance from each other.

Referring to the drawings, throughout which like reference numeralsdesignate like parts, 8 designates a relatively thin door in which thislock is installed said door being prepared for the reception of the lockby providing in the same a cavity or mortise of rectangular crosssection that extends from the front edge of the door rearwardly and isof substantially the shape indicated by dotted lines in Fig. 2 and byboring from the side of the door a hole as indicated by dotted lines inFig. 1 that intersects said mortise cavity.

This lock comprises three distinct parts, namely, a latch housing orsecondary lock mechanism, Fig. 5, a lock core case or housing, Fig. 6,and a lock core, Fig. 7.

The secondary lock mechanism proper, which is not herein disclosed butwhich may be of any desired construction, is disposed within a housing 9of relatively thin rectangular shape that is secured to a front plate 10which is provided with suitable holes 11. through which screws 12 may beinserted to secure the same to the door 8. An opening 13 is provided inone side of the housing 9.

A core case 14: preferably cylindrical on the exterior and provided withan internal recess 15 of figure 8 cross sectional shape is adapted to besecured to the side of the secondary housing 9 by screws 16 that screwinto nuts 17 within the inside of such housing, see Fig. The nuts 17 arepreterabiy permanent-1y fastened within the housing 9,

A lock core 18 having an end flange 19 is arranged to be removablylocked within the recess 15 of the core case 1%, said removable lockcore afiording access to the screws 16 when removed and preventingaccess to said screws when it is inserted. The screws 16 are'located onopposite sides of the figure 8 recess 15 and the flange 19 on the corecovers the heads of such screws when the core is inserted in the corecase.

In installing this loclqthe door-is niortiscd to receive thesecondaryhousing 9 and plate '10 and ahole of the same diameter astheexterior of the core case? A. is bored to intersect the mortise at theproper location. The secondary housing is then inserted in the mortiseand the core case 1.4- with the core re-H core 18 may then be insertedand locked within the core case l-t thereby protecting the heads ofithescrews 16 and making it impossible to remove said screws without firstremoving the lock core.

The screws 16 constitute the only means needed for securing the corecase 14: to the housing '9 and the use of said screws for this purposeis inade possible by the; provision of a lock core that is readilyremovable from thecore case.

Thesecondary housing 9, in a thin mortise lock of this nature isnotstrong enough to permit a lock core to be screwed thereinto and noroom is afforded in said secondary housing for the provision of lockingscrews that are accessible from the edge of the door or drawer intowhich the lock is mortised thus making it practically impossible toadaptgpin tumbler locks that depend on this method of securing the lockcore to the lock housing to a thin cabinet type mortise lock.

The core case 14 is open at the innerend and is arranged to registerwith the opening 13 in the secondary housing 9 when it is securedthereto.

The foregoing description and accompanying drawings clearly disclosewhat I no consider-to be a preferred embodiment of my invention, but itwill be understood that changes in the same may be resorted to withinthe scope of the "following claims.

I claim: 7

1.1n a mortise lock, a secondary loch housing, a core case, a lock corearranged for removal from said core case and means accessible only whensaid core is removed for securing said core case to said secondary lockhousing. 7

2. A mortise lock enibodyingia secondary lock housing arranged to beinserted in a mortise, a core case, a lock core arranged to be removedfrom said core case and n'ieans accessible only from the interior ofsaid core case tor securing said core case to said secondary lockhousing. 3. A mortise lock embodying a-relatively thin fiat secondarylOt'k housing having an opening in one side, a core case arranged to titagainst the side of said secondary locl: housing and covering saidopening, screws accessible only from the interior of said core case forsecuring said core casc to said secondary loch housing, and a lock coreremovable troni said core case to atl'ord access to said screws. 7

in a niortise look, a relatively thin tiat secondary lock housingadaptedTo he inserted in amortise, a core case arranged to tit'againstthe side of said secondary lock housing. said core case having a recessof figure 8 cross sectional shape, two screws disposed on opposite sidesof said recess for securing said core case 'to said secondary lockhousing and a lock core arranged to be locked within said core case andremovable therefrom to afford access to said screws.

In a mortise lock the combination with a door having two intcrs actingmortise holes, of a secondary lock housing arranged to be inserted intoone of said holes. a recessed core case arranged to be inserted into theother of said holes, a lock core arranged to be removably locked withinsaid core use and means accessible only when said lock core is removedfor securing said core case to said secondary lock housing.

6. In a mortise lock. a secondar lock housing, a core case. screwsextending from the outer endo'f said core case in wardiy for securingsaid core case to said secondary lock housing, a lock core removablefrom said core case and a face plate on said lock core arranged to coverthe heads of said screws when said lock core is within said core case.

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